Gates' prediction regarding the future of computers

Bill Gates has resently said that he believes that the next big change in how we use computers will be about applications running on multiple types of interactive devices, simultaneously or not (see the interview on the Jimmy Fallon show http://www.youtube.com/watch?v=Qk7pPutimCM).

What do you guys think he was specifically talking about? Do you think could-based operating systems will be part of this? What new types of display and input technologies (such as wearable devices or augmented reality technologies) will be part of it?